Citrine Chemical composition: SiO2 (minor Fe3+ impurities cause citrine's color) •Class: tectosilicate •Crystal system: Hexagonal-R; 32 (trigonal-trapezohedral) •Crystal habit: Macroscopic crystals occur as horizontally striated hexagonal prisms terminated by a combination of positive and negative rhombohedrons forming six sided pyramids. Citrine also occurs as drusy masses showing only the rhobohedral terminations. It can also be massive. •Twinning: Dauphine twin with c the twin axis, Brazil twin with {1120} the twin plane •Specific gravity: 2.65 •Index of refraction: 1.54-1.55 •Birefringence: 0.009 •Pleochroism: perceptible •Hardness: 7 •Color: shades of yellow to reddish-orange •Luster: vitreous •Transparency: transparent to translucent •Cleavage: none •Fracture: conchoidal •Streak: white
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